Tectono-sedimentary evolution of a rift system controlled by Permian post-orogenic extension and metamorphic core complex formation (Bidarray Basin and Ursuya dome, Western Pyrenees)

Saspiturry, Nicolas; Cochelin, Bryan; Razin, Philippe; Leleu, Sophie; Lemirre, Baptiste; Bouscary, Chloé; Issautier, Benoît; Serrano, Olivier; Lasseur, Éric; Baudin, Thierry; Allanic, Cécile

doi:10.1016/j.tecto.2019.228180

Cited by 29 publications

(72 citation statements)

References 101 publications

(147 reference statements)

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“…Our model does not account for the exhumation of the lower crust along detachment faults during the latest stages of the CPR. While this mechanism has been previously emphasized (Labourd area; Jammes et al, 2009;Masini et al, 2014), recent work has challenged this view (Saspiturry et al, 2019). Indeed, exhumation of granulites originating from the lower crust has occurred in the Pyrenees during Hercynian extension (e.g.…”

Section: Accepted Articlementioning

confidence: 98%

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Numerical modelling of Cretaceous Pyrenean Rifting: The interaction between mantle exhumation and syn‐rift salt tectonics

et al. 2019

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The pre-shortening Cretaceous Pyrenean rift is an outstanding geological laboratory to investigate the effects on lithospheric rifting of a pre-rift salt layer at sedimentary base. The occurrence of a pre-rift km-scale layer of evaporites and shales promoted the activation of syn-rift salt tectonics from the onset of rifting. The pre-and syn-rift sediments are locally affected by high-temperature metamorphism related to mantle ascent up to shallow depths during rifting. The thermo-mechanical interaction between décollement along the preexisting salt layer and mantle ascent makes the Cretaceous Pyrenean rifting drastically different from the type of rifting that shaped most Atlantic-type passive margins where salt deposition is syn-rift and gravity-driven salt tectonics has been post-rift. To unravel the dynamic evolution of the Cretaceous Pyrenean rift, we carried out a set of numerical models of lithosphere-scale extension, calibrated using the available geological constraints. Models are used to investigate the effects of a km-scale pre-rift salt layer, located at sedimentary cover base, on the dynamics of rifting. Our results highlight the key role of the décollement layer at cover base that can alone explain both salt tectonics deformation style and high Accepted Article This article is protected by copyright. All rights reserved. temperature metamorphism of the pre-rift and syn-rift sedimentary cover. On the other hand, in absence of décollement, our model predicts symmetric necking of the lithosphere devoid of any structure and related thermal regime geologically relevant to the Pyrenean case.

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Section: Accepted Articlementioning

confidence: 98%

“…Indeed, exhumation of granulites originating from the lower crust has occurred in the Pyrenees during Hercynian extension (e.g. Bouhallier et al, 1991;Vissers et al, 1992;Saint Blanquat, 1993), therefore predating the formation of the CPR (Saspiturry et al, 2019).…”

Section: Accepted Articlementioning

confidence: 99%

Numerical modelling of Cretaceous Pyrenean Rifting: The interaction between mantle exhumation and syn‐rift salt tectonics

et al. 2019

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“…In the western Pyrenees, the North Pyrenean Zone corresponds to the inverted Mauléon basin (Figure 1; Ducasse & Vélasque, 1988; Souquet et al, 1977). The Mauléon basin is offset by the N20°E trending Saint‐Jean‐Pied‐de‐Port, Saison, and Barlanès transfer faults inherited from the Permian (Saspiturry, Cochelin, et al, 2019) and developed during the Albian rifting stage (Figure 1c; Canérot, 2008, 2018a, 2018b; Debroas et al, 2010). The Iberian (southern) proximal margin corresponds to the Axial Zone, consisting of a Paleozoic substratum overlain by a postrift Upper Cretaceous carbonate platform (Souquet, 1967), and the Paleozoic “Massifs Basques” (Muller & Roger, 1977) represent its western prolongation (Figure 3).…”

Section: The Mauléon Basinmentioning

confidence: 99%

Paleogeothermal Gradients Across an Inverted Hyperextended Rift System: Example of the Mauléon Fossil Rift (Western Pyrenees)

et al. 2020

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The fossil rift in the North Pyrenean Zone, which underwent high temperature-low pressure metamorphism and alkaline magmatism during Early Cretaceous hyperextension, was studied to explore the geothermal regime at the time of rifting. In this work, we combined Raman lab analysis and thermal numerical modelling to shed light on the distribution of geothermal gradients across the inverted hyperextended Mauléon rift basin during Albian and Cenomanian time, its period of active extension. Data were acquired from a set of 155 samples from densely spaced outcrops and boreholes, analyzed using Raman spectroscopy of carbonaceous material. The estimated paleogeothermal gradient is strongly related to the structural position along the Albian-Cenomanian rift, increasing along a proximal-distal margin transect from~34°C/km in the European proximal margin to~37-47°C/km in the two necking zones and 57-60°C/km in the hyperextended domain. This pattern of the paleogeothermal gradient induced a complex interaction between brittle and ductile deformation during crustal extension. A numerical model reproducing the thermal evolution of the North Pyrenees since 120 Ma suggests that mantle heat flow values may have reached 100 mW/m 2 during the rifting event. This model reveals that above the thermal pulse, the temperature gradient varied within a small range of 55 to 62°C/km, as inferred from RSCM peak temperatures. We demonstrate that the style of reactivation during subsequent convergence influenced the thermal structure of the inverted rift system.

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“…The lowermost part corresponds to the Wang et al (2016) Vp model showing the presence at shallow depth of continental lithospheric mantle. The uppermost part is materialised by the Saspiturry, Cochelin, et al (2019) crustal-scale balanced cross-section calibrated using (from south to north) the Ronca, Ainhice, Uhart-Mixe, Bellevue, Orthez, Amou and Bastennes Gaujacq boreholes. (c1, c2) Geological section through the present-day Mauléon basin based on interpreted seismic lines and field data (modified from Saspiturry et al, 2019a).…”

Section: Basque-cantabrian Basinmentioning

confidence: 99%

“…The Mauléon basin is exposed within a pop-up structure formed during N-S Pyrenean compression. (c3) Palinspastic restoration, to Santonian time, of the Saspiturry, Cochelin, et al (2019) crustal-scale balanced cross-section. (c4) Detail of the palinspastic restoration of the Saspiturry, Cochelin, et al (2019) crustal-scale balanced cross-section, with RSCM syn-rift palaeotemperature of Basque-Cantabrian basin has an overall symmetric shape characterised by brittle deformation on its flanks and ductile deformation on its axis (DeFelipe et al, 2017;Ducoux et al, 2019;Pedrera et al, 2017).…”

Section: Basque-cantabrian Basinmentioning

confidence: 99%

Review of Iberia–Eurasia plate‐boundary basins: Role of sedimentary burial and salt tectonics during rifting and continental breakup

et al. 2021

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We document the role of sedimentary burial and salt tectonics in controlling the deformation style of continental crust during hyperextension. The Iberian-European boundary records a complex history of Cretaceous continental extension, which has led to the development of so-called smooth-slope type basins. Based on the review of the available geological constraints (crustal-balanced cross-sections, sedimentary profile evolution, RSCM thermometer, low-temperature thermochronology) and geophysical data (Bouguer anomaly, Moho depth, seismic reflection profiles and Vp/Vs velocity models) on the Tartas, Arzacq, Cameros, Parentis, Columbrets, Mauléon, Basque-Cantabrian and Internal Metamorphic Zone basins, we shed light on the main characteristics of this type of basin. This synthesis indicates that crustal thinning was influenced by two decoupling horizons: the middle crust and Triassic prerift salt, initially located between the basement and prerift sedimentary cover. These two horizons remained active throughout basin formation and were responsible for depth-dependent thinning of the crust and syn-rift salt tectonics. We therefore identify several successive deformation phases involving (a) pure shear dominated thinning, (b) simple shear dominated thinning and (c) continental breakup. In the first phase, distributed deformation resulted in the development of a symmetric basin. Field observations indicate that the middle and lower crust were under dominantly ductile conditions at this stage. In the second phase, deformation was localised along a crustal detachment rooted between the crust and the mantle and connecting upwards with Triassic prerift salt. During continental breakup, basin shoulders recorded the occurrence of brittle deformation, whereas the hyperextended domain remained under predominantly ductile thinning. The formation of smooth-slope-type extensional basins was intrinsically linked to the combined deposition of thick syn-rift and breakup sequences, and regional salt tectonics. They induced significant burial and allowed the continental crust and the prerift sequence to deform under high temperature conditions from the rifting to continental breakup stages.

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Tectono-sedimentary evolution of a rift system controlled by Permian post-orogenic extension and metamorphic core complex formation (Bidarray Basin and Ursuya dome, Western Pyrenees)

Cited by 29 publications

References 101 publications

Numerical modelling of Cretaceous Pyrenean Rifting: The interaction between mantle exhumation and syn‐rift salt tectonics

Numerical modelling of Cretaceous Pyrenean Rifting: The interaction between mantle exhumation and syn‐rift salt tectonics

Paleogeothermal Gradients Across an Inverted Hyperextended Rift System: Example of the Mauléon Fossil Rift (Western Pyrenees)

Review of Iberia–Eurasia plate‐boundary basins: Role of sedimentary burial and salt tectonics during rifting and continental breakup

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